113. Every decorator who handles fabrics, every cabinetmaker who lays out the woodwork of a room, every stained glass window maker, should appreciate one fact: A line which is finished at the top or bottom, or both, with acute angles appears longer than the line that is finished top and bottom with an obtuse or right angle. It is the same with the finish of a wall frieze.
If the wall frieze ends abruptly ([Illustration A] on page 57), it is foreshortened; if it is finished by angles ([Illustration B]), the height of the room is apparently greater. (See the illustration on page [51].)
114. It is the same way with curves; given two lines of equal length and enclose one with convex and the other with concave curves, and the line enclosed convex will appear longer.
Treated for Broken Heights.
115. In dress a collar brought down to an acute angle in the front of the waist gives height effect, whereas a perfectly straight collar around the neck reduces the apparent height and gives width effect.